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Expert Oracle Exadata - Parent Directory

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• CONTENTSBits and Pieces....................................................................................................................................... 12Software Components .....................................................................................................12Database Server Software...................................................................................................................... 12Storage Server Software ........................................................................................................................ 16Software Architecture......................................................................................................18Summary .........................................................................................................................21• Chapter 2: Offloading / Smart Scan ......................................................................23Why Offloading Is Important ............................................................................................23What Offloading Includes.................................................................................................27Column Projection .................................................................................................................................. 27Predicate Filtering .................................................................................................................................. 32Storage Indexes...................................................................................................................................... 33Simple Joins (Bloom Filters)................................................................................................................... 34Function Offloading ................................................................................................................................ 37Compression/Decompression................................................................................................................. 39Encryption/Decryption ............................................................................................................................ 40Virtual Columns ...................................................................................................................................... 41Data Mining Model Scoring .................................................................................................................... 43Non-Smart Scan Offloading.................................................................................................................... 44Smart Scan Prerequisites ................................................................................................45Full Scans............................................................................................................................................... 45Direct Path Reads................................................................................................................................... 45<strong>Exadata</strong> Storage ..................................................................................................................................... 46Smart Scan Disablers ......................................................................................................49Simply Unavailable ................................................................................................................................. 49Reverting to Block Shipping ................................................................................................................... 49Skipping Some Offloading ...................................................................................................................... 50vi

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